CAUSES OF DAMAGES OF PUMP-COMPRESSOR PIPE CLUTCHES

Abstract

Background. The object of research is the clutch of pump-compressor pipes (tubing). The subject of the study is metallographic studies of the areas of crack origin in the metal of clutches. The purpose of this work is to determine the causes of damages of pump-compressor pipe clutch during operation. Materials and methods. Investigation of the crack formation causes because of the impact on the tubing clutches of a corrosive environment and mechanical damage that occurred during operation, as well as analysis of fractographic and metallographic destruction methods. Results. Considered the destruction of the clutches of the tubing when exposed gray-and-hydrogen-containing environment, correlation of microcracks with mechanical damages of the clutch and formation of dents-scratches from installation Toolkit when a certain torque is required for the formation of a sealed threaded connection. Conclusions. Comparison of the considered fractures allowed us to conclude that the main causes of failure of tubing couplings are stress concentrators - dents-risks on the outer surfaces of the couplings. The impact of unregulated assembly stresses and a hydrogen sulfide-containing working medium on the area of the dents-marks of the coupling leads to the appearance of microcracks of hydrogen cracking under conditions of a complex stress state.

Keywords

• damage
• corrosion medium
• stress
• clutch
• tubing
• chemical composition
• metallographic examination
• metal microstructure
• tension
• impact bending
• hardness